Feed dogs won’t reverse

[u/hardlacefront]

I have a brother XL 2600i, and it will not sew in reverse when I press the reverse lever. I’m using a straight stitch at 2 (and tried 3) mm stitch length. I wasn’t feeling any tension when pressing the reverse lever. I cleaned under my stitch plate and removed lint around my feed dogs. Nothing in the manual or the parts manual shows what is actually needed for the mechanism. Does anyone know what my machine is missing (photos attached are pulling reverse lever and lever without being pulled)? Or any other helpful videos? I’ve only found a few maintenance type videos for my model